x<template>
  <div>
    <span>全选:</span>
    <input v-model="isAll" type="checkbox"/>
    <button @click="change">反选</button>
    <ul>
      <li v-for="(item,index) in arr" :key="index">
        <input v-model="item.c" type="checkbox"/>
        <span> {{item.name}} </span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
  methods: {
    // 点击反选
change(){
  this.arr.forEach(item => item.c= !item.c)
}
  },
  computed: {
isAll:{
  set(a){
    this.arr.forEach(item => item.c = a)
  },
  get(){
    return this.arr.every(item=> item.c)
  }
}
  }
};
</script>